package q1_50.q1_10;

public class Solution2 {
    /**
     * Definition for singly-linked list.
     */
    public static class ListNode {
        int val;
        ListNode next;

        ListNode() {
        }

        ListNode(int val) {
            this.val = val;
        }

        ListNode(int val, ListNode next) {
            this.val = val;
            this.next = next;
        }
    }

    public static ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode head = null, tail = null;
        int carry = 0;
        while (l1 != null || l2 != null) {
            int n1 = l1 != null ? l1.val : 0;
            int n2 = l2 != null ? l2.val : 0;
            int sum = n1 + n2 + carry;
            if (head == null) {
                head = tail = new ListNode(sum % 10);
            } else {
                tail.next = new ListNode(sum % 10);
                tail = tail.next;
            }
            carry = sum / 10;
            if (l1 != null) {
                l1 = l1.next;
            }
            if (l2 != null) {
                l2 = l2.next;
            }
        }
        if (carry > 0) {
            tail.next = new ListNode(carry);
        }
        return head;
    }

    public static void main(String[] args) {
        int[] l1 = {2, 4, 3};
        int[] l2 = {5, 6, 4};
        ListNode listNode1 = new ListNode(l1[0]);
        ListNode listNode2 = new ListNode(l2[0]);
        ListNode Temp1 = listNode1;
        ListNode Temp2 = listNode2;
        for (int i = 1; i < l1.length; i++) {
            Temp1.next = new ListNode(l1[i]);
            Temp2.next = new ListNode(l2[i]);
            Temp1 = Temp1.next;
            Temp2 = Temp2.next;
        }
        ListNode listNode = addTwoNumbers(listNode1, listNode2);
        while (listNode != null) {
            System.out.print(listNode.val);
            listNode = listNode.next;
        }
    }
}
